Loose-leaf binder.



souri, and THOMAS E. HEETER, a resident of I rrn strane 'AT fr n 16E.

THOMASE. rFEETEE, or MAPLEWOOD,

JAMES o. DAWSON, or Sfr. Louis, AND MISSOURI., ASSIGNORS To SIEBER TION OF MISSOURI.

No. 853,963.v

' Specification of Letters Patent.

& TRUSSELL MNFG. CO., A CORPORA- Patented may 21, 1907.

Application tied November 16,1906. Serial No. 843,597. l

To ali/whom tm/(ty con/cern' Be it known that we, JAMES C. Dawson, a residentvof the city of St. Louis, State oth/[1sin which therev is provided between the covers of a book a plurality of pairs of mating when closed.

Sheet-receiving prongs mounted to swing in a. planev transverse-to the, length of the book and .curved toform iiling rings or arches Indevices of this kind it is desirable that the parts shouldbe light and strong, 'and that V mechanism capable of transmitting great force `Should be provided for closing the filing arches and for locking the prongs in the closed position. i

The object oi the invention is'to provide a loose leaf binder of simple and dural'ile con struction, and comprising improved vmedianism i'or opening and closing the filing arches.

The invention is exempliiicd in the structure to be herein described, and illustrated in thelaccompanying draw-ings, iii which- Figure 1 is a plan view of the binder meehanism showing a detail of the covers to which it is attached; Figs. 2, 3 and 4 are sectional views on the lines 2 2, 3,-3 and 4--4 of Fig.

, 1; and Fig. 5 is a detailperspective view -showing` a spring employed in the device.

The binder mechanism of a looseleaf book constructed according to the invention preferably includes a supporting structure comprising a pair of l metalplat'es 10, 1], one o1 which, as the late 10, is shown as being of substantially t'e same length as the covers 12 of the book, Preferably the plate 1 0 is bowed to conform to the shape of the back 0il the book, and is embedded within the material of the covering, as shown, being provided with ears 13, 14, which project upwardly therethrough. s

The plate 11 is secured in position by means oi' the ears 13, 14, and as shown is longitudinally bowed upwardly to provide an elongated chamber 15 for the operating mechanism'. A plurality of 4filing ri s or arches are rovided for receiving the s eets to be bound, andas-shown each comprises a pair of mating binding post members 16, '17.

ner end a transverse pivotv rod 18, and

through this rod is oscilla'tably secured lt'o the plate 11, by means olf lugs or ears 19 turnedI up on the body of the plate and surrounding the rod. The inner ends 20, 21, of the binding post members eXtendn-to the chamber 15 thro ugh apertures 22. inthe plate 11.

Means are rovided for egagmig, the inner ends of the i? arches as shown, a cam-piece 23 having cams 24 adapted t'o bear downwardly on the inner ends 20, 21, of the binding.

post members, and a thumb-piece 25 projecting beyond the end of the binder mechanism, is slidingly` mounted within the chamber, being held in place against the under surface of the plate 1 1 by means of a plurality of lugs 26.

For opening each of the iiling arches, a spring, adapted to bear upwardly on the inner ends of the binding post' members, is provided. As shown, this takes the form of a leaf spring 27, secured to the iloor of the chamber 15 by means-of luos 28 turned up from the plate 10 and slittedor a portion of its length to provide three arms 29, 30, 31. Two of these arms, as 29 and 30, are preferably curved upwardly for engaging the inner endsof the binding post members, while the third arm,

as 31, is curved downwardly to react upon the floor of the chamber coperating with the "Each of the binding post members 16, 17, has rigidly mounted therein adjacent its '111-' inding post membesto operi and close the filing arches.v For closing arms 29, 30, the lugs 28 permitting some' rocking movement of the spring plate. l 4

In using the device the binding post members 16, 17, may besswung on .their pivots toopen and close the iiling arches byl shifting the cam-piece 23, the cams 24` engaging the inner ends of the binding post members to 4 close the arches whenever the cam-piece is advanced, and the spring arms 29 and 30 serving to openthe arches Whenever the cams 24 are Withdrawn from contact with the inner ends of the binding post members. The rounded form of cams 24 provides means for for when the cam-piece 23 has reajehedthe limit of its 'forward movement the highest ICO ' firmly locking the arches in a closedv position, A

lic:

Ifi

portion `oi the cam has vpassed the point of contact 'with the inner' ends of the binding post members. v' t As the cam-piece. 23 is located between the inner ends of the bindingpost members and the cover of the housing or chamber 15, great force may be applied for closing the filing arches Without danger of stripping the binding mechanism'from the covers 12 or base plate 10. 1

We claim as our inventionl. In a loose leaf binder, in combination, a longitudinally and upwardly bowed supporting plate,` an openable arch comprising a pair ci' mating binding post members pivotally mounted in the plate at opposite sides of its l crown, each of the posts having one end exl tending below the plate, and a cani-plate injg plate, an openable arch of mating binding post members crown, each of t e mounted within'the bowed portion of the plate and reacting downwardly on.- the inner ends ofthe posts.

2. In aloose leaf binder, in combination, a longitudinally and upwardly bowed supportcomprising a pair ivotally late at opposite sides of its osts having one end mounted in the tending belowthe p ed within the bowed portion of the plate and reacting downwardly on the inner ends of the posts, and a spring opposing the cam.

. '3f In a loose leaf binder, in comliin ation, a slidewayy housing consisting of a base plate forming the floor of the housing and a longitudinally bowed plate secured thereto, and forming the side walls and'cover of the housing, an openable filing arch comprising a pair .oi mating binding post members each pivotally mounted in a side wall of the housing and having one end extending into its interior, a spring reacting between the floor ol the housing and the inner ends oi theposts,

and a camlate mounted on the cover of the honsin an reacting downwardly on the iiiner en s of the posts.

. 4. In aloose leafI binder, in combination, a slideway housing, an openable arch com rising a pair ofl mating binding post niein )ers each pivotally mounted in a side wall oft the housing and having one end extending into its interior, a spring reacting between the ioor of the housing and the inner ends oi' the posts, and a cam-plate mounted on the cover of the housing and "reacting downwardly on the inner ends of the posts.Y

5. In a loose lest-binder in combination, a

v n I l supporting member, a binding post member ate, a cam-plate mount- 'spring secured to the one portion ol the spring engaging the bindeeaees movably mounted thereon, and a reciprocable cani having a rounded face engaging the' post, the highest part of the cam being adapted to pass the point of contact with the post before reaching the limit oi its movement in one direction.

6. In a loose leaf binder, in combination, a longitudinally and u )wardly bowed supporting plate, an openable arch comprising a pair of mating binding post members pivotally mounted in the late at opposite sides of its crown, each of t ie posts having one end extending below the plate, and a reeiprociible cam mounted within the bowed portion of the plate and having arounded face reacting downwardly on the innerv ends of the posts, the highest part of the cani being adapted to pass the point of contact with the posts beiore reaching the limit of its movement in one direction.

7. In a loose leaf binder, in combination, a supporting member, an openable arch comprising a pair of mating binding post members pivotally mounted on the supporting member, means for closing the arch, and a three-part spring for opening the arch, one of its parts engaging each of the binding post members and the other part reacting upon the supporting member.

8. ln loose leaf binder, in combination, a supporting member, an openal'ile arch coniprising a pair of mating binding post meinbers pivotally mounted on the supporting member, a leaf spring mounted on the supporting member and having three arms, two

' arms of the springs being bowed upwii-idlv,

one of suoli arms eiigagii'ig each oi' the binding post members and the other arm ci the spring being bowed downwardly and reacting upon the suiiiporting member, and means for turning the binding post members in opposition to the spring.

9. ln a loose leaf'binder, in combination, a supiorting member, a binding post member oseillatal'ily mounted thereon', a divided leaf supporting member,

ing post member and another portion of the spring reacting upon the supporting inember, and means for moving the binding member in opposition to the spring.

JAMES (l. DJUVSON. THOMAS lil. lIElCIElt.

posi' Witnesses:

Roisin ll. Conn, Jr., W. S. (haven.

IOC 

